Evacuação de descarrilamento de metrô e trem¶

Uma colisão de metrô, acidente de trem suburbano ou descarrilamento de trem de alta velocidade produz forças cinéticas violentas, escuridão total repentina, vidros voando e pânico imediato dos passageiros. No entanto, as investigações de segurança nos transportes em todo o mundo confirmam um facto crítico: em incidentes ferroviários subterrâneos e electrificados, mais passageiros sobreviventes morrem ou ficam gravemente feridos após o acidente, ao pisarem em terceiros carris de alta tensão, ao entrarem no caminho dos comboios que se aproximam em vias paralelas, ou ao inalarem fumo tóxico do túnel durante auto-evacuações descoordenadas do que durante o impacto inicial do descarrilamento em si.

O que você faz nos primeiros sessenta segundos após as rodas saírem da pista determina sua sobrevivência. Saber como se preparar durante a desaceleração, quando se abrigar dentro do vagão de aço versus quando sair, como identificar terceiros trilhos letais de 750 volts e fios catenários aéreos de 25.000 volts e em que direção caminhar em um túnel de metrô cheio de fumaça levará você e aqueles ao seu redor para a segurança.

Faça isso agora¶

1. Apoie-se até que todo o movimento do trem e impactos secundários parem completamente: Se estiver sentado, coloque os dois pés apoiados no chão, incline-se para a frente e cruze as mãos atrás da cabeça/pescoço. Se estiver em um vagão do metrô, ajoelhe-se imediatamente ou sente-se no chão e segure a base de um poste vertical de metal com as duas mãos.
2. Stay inside the railcar unless fire, dense smoke, or rising water forces you out: The steel body of a passenger railcar shields you from live high-voltage wires, trains moving on adjacent tracks, and unstable tunnel debris. Wait for the conductor's announcement or use the passenger emergency intercom next to the doors.
3. Trate cada terceiro trilho, placa de cobertura e fio pendurado como 100% vivo e letal: Nunca toque ou pise no terceiro trilho elétrico elevado (600 a 1.000 volts CC), sua placa de cobertura protetora de madeira ou fibra de vidro ou qualquer fio catenário suspenso caído (11.000 a 25.000 volts CA).
4. Evacuate through the end doors between cars or onto the raised wall catwalk: If fire or heavy smoke requires immediate evacuation, walk through the front or rear end doors into an adjacent safe car, or climb directly onto the raised concrete emergency walkway along the tunnel wall rather than jumping 1.5 meters (5 feet) out a side door onto the third rail.
5. Walk single-file between the two running rails if on the track bed: If no raised wall walkway exists and you must walk on the track floor, stay strictly in the center between the two steel running rails of your own track, never crossing over to parallel tracks where high-speed trains may still be approaching.
6. Vá contra o vento contra o fluxo de ar se houver fumaça e localize uma Estação de Luz Azul: Mova-se abaixo da fumaça crescente em direção ao ar fresco que entra e procure por uma lanterna azul na parede do túnel marcando um telefone de emergência e um interruptor de corte de energia de tração.

Train derailment and subway tunnel evacuation workflow¶

Use this decision tree immediately after a rail impact or sudden emergency stop to choose between staying inside the car and executing a controlled track evacuation.

flowchart TD
    A["Train Derailment or Emergency Stop"] --> B["Brace on floor until all motion ceases completely"]
    B --> C{"Is there active fire, dense smoke, rising water, or chemical leak?"}
    C -->|"No: car is intact and breathable"| D["STAY INSIDE THE CAR: Press emergency intercom and call 911/112/999"]
    C -->|"Yes: immediate life threat inside car"| E{"Can you pass through end doors into an adjacent safe car?"}
    E -->|"Sim"| F["Move passengers through end doors away from fire or smoke"]
    E -->|"No: must exit onto tunnel or track"| G{"Is there a raised tunnel wall walkway?"}
    G -->|"Sim"| H["Open door on walkway side only and walk single-file holding handrail"]
    G -->|"No: track-level exit required"| I["Spot the Third Rail location first: exit on the opposite side if possible"]
    I --> J["Walk strictly in the center between the two running rails toward Blue Light or Exit"]

Surviving the impact: crash biomechanics and brace positions¶

Unlike passenger cars, most urban subways, light-rail trams, and regional commuter trains do not have passenger seatbelts, and up to two-thirds of rush-hour subway riders are standing when an impact occurs. When a train moving at 80 km/h (50 mph) derails or strikes an obstruction, unbraced standing passengers are thrown the length of the car at highway speed, striking metal poles, glass partitions, and other riders.

How to brace in the 2 to 5 seconds after feeling derailment vibration¶

A train almost never stops instantaneously; when wheels drop off the steel rail onto wooden or concrete ties (sleepers) and stone ballast, you will first hear a deafening metallic roar and feel violent vertical bouncing for several seconds before the cars jackknife, tilt, or collide with a tunnel wall.

• If standing in a subway or commuter car: Do not try to remain standing by holding an overhead hanging strap; your upper-body grip strength cannot resist a 5G deceleration force. Immediately drop flat onto the floor or onto your knees, press your back or shoulder tightly against a fixed seat base or bulkhead wall facing away from the direction of travel, and wrap your arms around the bottom of a vertical floor-to-ceiling pole while tucking your chin to your chest.
• If seated facing forward (in the direction of travel): Place both feet flat on the floor behind your knees, bend forward at the waist so your torso rests near your thighs, press your forehead against the padded seatback in front of you, and lock your hands behind the back of your neck to stabilize your cervical spine and block flying glass.
• If seated facing backward (opposite the direction of travel): Backward-facing rail seats are biomechanically the safest seats in a frontal collision because the seatback supports your entire spine and head during primary deceleration. Sit all the way back with your spine and the back of your head pressed firmly against the headrest, plant your feet wide on the floor to brace against the secondary rebound, and cross your arms over your chest or face.
• Shield your eyes and airway from brake and concrete dust: As soon as a train derails in an underground tunnel, decades of accumulated steel brake dust, silica ballast dust, and shattered window glass fill the cabin air. Pull your shirt collar, jacket, or scarf up over your nose and mouth and squint or shield your eyes until the dust settles.

Stay inside vs. evacuate: the golden rule of rail safety¶

Once the train comes to a halt and emergency backup battery lights flicker on, natural human claustrophobia makes passengers want to pry open the doors and jump onto the tracks. Resist this urge and stop fellow passengers from forcing doors open unless a life-threatening hazard is inside your car.

Why staying inside the car is almost always safer¶

• The Faraday cage effect against overhead high voltage: When an electric commuter or intercity train derails, the overhead 25,000-volt catenary wire frequently snaps and drapes across the metal roof of the passenger car. As long as you remain completely inside the metal railcar, the current flows harmlessly around the outer skin to ground. If you step out the door and touch the metal handrail while placing one foot on the ground, you become the path to ground and are electrocuted instantly.
• Parallel-track high-speed train strikes: On multi-track rail corridors and subway express tunnels, trains on the adjacent track only 1.2 meters (4 feet) away may still be hurtling toward the crash site at 100 to 200 km/h (60 to 125 mph) before central dispatch knows a derailment has occurred.
• Automated traction-power shutdown delay: Rail control centers need several minutes to confirm an incident, halt adjacent trains, and remotely de-energize the third rail across the tunnel sector.

The 5 conditions that require immediate self-evacuation¶

Only open emergency doors and leave the train without crew supervision if:

1. Visible flames or scorching heat are spreading inside or directly beneath your railcar.
2. Thick, choking smoke is filling the car and you cannot move through the end doors into a smoke-free car.
3. Water is actively rising inside the car (such as inside an underwater river tube, coastal causeway, or flash-flooded subway cut).
4. Um vazamento perigoso de combustível químico ou diesel de um vagão-tanque de carga ou locomotiva adjacente está se acumulando ao redor do seu carro com fortes vapores químicos.
5. O carro está oscilando de forma instável na beira de um aterro desabado ou brecha estrutural onde permanecer dentro do veículo corre o risco de uma queda imediata.

Riscos elétricos em trilhos e túneis explicados¶

Cada pessoa que viaja de metrô ou trem suburbano deve compreender o layout físico do leito dos trilhos para saber exatamente onde reside a eletricidade letal e onde é seguro colocar os pés.

Step-by-step protocol for evacuating a railcar safely¶

If fire, smoke, or crew orders require you to evacuate the train inside a tunnel or along an open right-of-way, follow this strict sequence to prevent falls and electrocution.

1. Choose the safest exit door in this exact priority order¶

1. First choice: End doors between railcars (Inter-car gangway): If only one car has smoke or a small electrical fire underneath it, open the center door at the end of the car and walk across the threshold plate into the next car of the same train, closing the heavy fire-rated end door behind you. You stay completely off the tracks and out of danger.
2. Second choice: Side door opening directly onto a raised tunnel benchwall / catwalk: Look out the windows on both the left and right sides of the car before pulling any emergency door release. Most subway tunnels have a raised concrete emergency walkway (benchwall) along one wall of the tunnel, while the third rail runs along the floor on the opposite side. Always open the door that faces the raised concrete walkway so you can step straight across onto the catwalk without dropping down to track level.
3. Third choice: Front or rear cab end door with deployable ladder/ramp: If you must descend to track level, the end doors at the very front or very back of the train align directly with the safe center space between the two running rails and often feature built-in fold-down steps or evacuation ramps.
4. Last resort: Side passenger doors down to track ballast: Standard train floors sit 1.2 to 1.5 meters (4 to 5 feet) above the uneven stones of the track bed, and the third rail often runs directly underneath one side of the car just 30 centimeters (12 inches) outside the wheels. If you must exit a side door to the ground:
   • Look down with your phone flashlight before moving and ask loudly: "Is the third rail on this side?" If you see the raised third rail and its wooden/fiberglass cover board directly below the doorway, do not use that side door; open the door on the opposite side of the car instead (after checking rigorously that no train is approaching on any adjacent track).
   • Do not jump out upright. Sit down on the edge of the doorway floor, turn around on your stomach, grip the inside floor edge or side handrails with both hands, and lower yourself down feet-first until your shoes touch the stone ballast.

2. How to operate emergency door and window releases¶

• Pneumatic or electric side doors: Look directly above the door header or on the side pillar beside the doors for a red handle behind a clear plastic flap labeled Emergency Door Release. Pulling the handle down (and sometimes rotating it) vents air pressure or disengages the mechanical lock so you can push the two door leaves apart by hand. Note that on most modern trains, pulling the emergency door handle while the train is still moving automatically triggers the emergency brakes; wait until the train is stopped inside a station or safe flat section before pulling it.
• Emergency egress windows (Commuter and intercity rail): Double-deck and intercity railcars have specific windows framed in red or yellow rubber gaskets labeled Emergency Exit. Pull the red rubber gasket handle inward to rip the rubber seal out of the channel, then pull or push the entire framed glass pane inward or outward as indicated on the instruction decal. If using an emergency life hammer to break tempered safety glass, strike the bottom corner of the window firmly, never the bouncy center of the pane, and lay a thick jacket or blanket over the jagged bottom frame before climbing through.

3. Finding and using a subway tunnel "Blue Light Station"¶

In underground rapid-transit tunnels worldwide (particularly across North America, Europe, and Asia), you will see glowing blue lights mounted on the tunnel wall every 150 to 250 meters (500 to 800 feet) and at the ends of every station platform.

A Blue Light Station is your lifeline in a tunnel emergency. Directly beneath the blue light fixture you will find three critical tools:

1. An Emergency Telephone: A direct hardwired hotline handset or push-button intercom that rings straight to the Rail Control Center desk, automatically displaying your exact tunnel marker number to dispatchers even if cellular phone service is completely dead underground.
2. An Emergency Traction-Power Trip Switch ("Power Off Box"): A yellow or red pull-handle or break-glass push button that trips the high-voltage circuit breakers feeding the third rail in that tunnel zone, cutting off the 750-volt traction power immediately.
3. A Dry-Chemical Fire Extinguisher: Mounted in a bracket below the phone for suppressing small brake-shoe or trash fires.

Tunnel smoke dynamics: which direction should you walk?¶

During an underground train fire (such as an electrical arc fire beneath a car), the concrete subway tube acts like a horizontal chimney. Huge reversible tunnel ventilation fans mounted in shafts between stations are activated by transit control to push fresh air in from one station and exhaust smoke out the other end.

• Walk into the wind (against the airflow) away from the fire: Feel the direction of the air current on your face and watch which way the smoke is blowing. Whenever possible, evacuate away from the burning car into the incoming fresh air stream (upwind) rather than walking downwind in the same direction the smoke is traveling. Walking downwind means the toxic smoke plume moving at 3 to 5 meters per second (7 to 11 mph) will quickly overtake you in the tunnel before you reach the next station.
• Stay in the bottom 1 meter (3 feet) of air: Burning synthetic seat foam, wiring insulation, and fiberglass release superheated carbon monoxide, hydrogen cyanide, and hydrogen chloride gas that stratify along the top half of the tunnel ceiling. Bend low, breathe through a cloth dampened with water from your drinking bottle (never alcohol), and keep one hand lightly sliding along the raised walkway handrail so you do not lose your bearings if visibility drops to zero.
• Look for cross-passage fire doors in twin-bore tunnels: Modern deep-bore subways and underwater rail tunnels (such as the Channel Tunnel, Crossrail/Elizabeth Line, BART Transbay Tube, or modern Asian metros) are built as two separate parallel concrete tubes connected every 150 to 350 meters (500 to 1,150 feet) by pressurized, fire-rated steel cross-passage doors marked with bright green running-person lights. You do not need to walk kilometers to the next station; walk to the nearest green cross-passage door, push the panic bar to enter the pressurized safe corridor, and let the fire door close tightly behind you.

Special scenarios: underwater tubes, elevated bridges, and hazmat freight¶

1. Underwater subway tubes¶

If your subway train stops inside an underwater tunnel beneath a river or bay and water begins seeping or rushing in:

• Move immediately through the inter-car end doors toward the end of the train that is uphill (underwater tubes slope downward to a deep midpoint and then slope steeply upward toward both shorelines).
• Use the green-lit cross-passage doors to enter the central service gallery or adjacent tube, or walk briskly uphill along the raised emergency benchwall past the massive steel floodgates at the tunnel portal before they close.

2. Elevated rail viaducts and river bridges¶

• Extreme fall hazard: Elevated rail tracks often have open wooden ties with gaps looking straight down to the street 10 to 25 meters (33 to 82 feet) below, and many older elevated steel structures lack fenced guardrails along the outer edge or between tracks.
• Never climb out onto an elevated trestle unless flames are inside your car: Wait inside the railcar for fire department aerial ladder trucks or a rescue train pulled alongside on the adjacent track using a portable aluminum bridge board.

3. Mainline passenger trains near freight derailments¶

In North America and parts of Europe/Australia, passenger trains share rail corridors with heavy freight trains carrying pressurized tank cars of chlorine, anhydrous ammonia, vinyl chloride, or crude oil:

• If a collision involves freight tank cars and you see a vapor cloud, hear a loud hissing pressure-relief valve, or smell pungent chemical odors (like bleach, ammonia, rotten eggs, or sweet solvents), evacuate the train on the side away from the freight cars and walk rapidly upwind and uphill at least 800 meters (0.5 miles) away from the tracks. See our chemical spills and hazardous material leaks guide for full hazmat shelter and evacuation distances.

Rail passenger readiness checklist¶

Build these effortless habits every time you board a subway, tram, or commuter train:

• Count the rows or poles to the nearest exit and locate the intercom: As soon as you step onto a railcar, glance above the door to spot the Passenger Emergency Intercom button and the Emergency Door Release lever.
• Choose backward-facing or center-car seats on high-speed trains: When riding intercity or commuter rail, sitting in the middle cars of the train (rather than the very first car behind the cab or the very last car) and choosing a backward-facing aisle or window seat reduces impact injuries during collisions.
• Store heavy suitcases on low floor racks, never overhead: Place heavy rolling suitcases in the floor-level luggage racks at the ends of the car rather than on open overhead shelves where they become lethal falling weights during a derailment.
• Wear closed-toe, flat-soled shoes during your commute: Walking 500 meters (1,640 feet) over jagged limestone track ballast, greasy wooden ties, and steel rail switches in dark tunnels is treacherous in open-toed sandals or high heels.
• Carry a small pocket flashlight or keep your phone above 30% battery: A dedicated keychain LED light lets you inspect the track below a train door for the third rail while keeping both hands free to climb down safely.

Perguntas frequentes¶

Fontes verificadas¶

• Federal Railroad Administration (FRA, United States) and National Transportation Safety Board (NTSB, United States): Passenger Railcar Emergency Egress Standards (49 CFR Part 238) and Crashworthiness Survival Studies
• Federal Transit Administration (FTA, United States) and National Fire Protection Association (NFPA, United States): NFPA 130 Standard for Fixed Guideway Transit and Passenger Rail Systems (Tunnel Ventilation, Blue Light Stations, and Emergency Walkways)
• Office of Rail and Road (ORR, United Kingdom) and Rail Safety and Standards Board (RSSB, United Kingdom): DC Electrified Third/Fourth Rail Safety and Passenger Evacuation Procedures
• European Union Agency for Railways (ERA, European Union): Technical Specifications for Interoperability Relating to Safety in Railway Tunnels (TSI SRT)
• Transport Canada (Canada): Rail Safety Passenger Handling and Emergency Response Guidelines

Guias relacionados¶

• Carro na água
• Car breakdown on highways
• Chemical spills and hazardous material leaks
• Head injuries and concussions
• Emergency telephone numbers worldwide